Air-compressor.



No. 806,924. PATENTED DEC. 12, 1905. W. J. SCHULTZ.

AIR COMPRESSOR.

APPLICATION FILED mmu, 1904.

4 SHEETS-SHEET 1.

v @lfimssw M 1 r 31! Qitumngg No. 806,924. PATENTED DEC. 12, 1905.

W. J. SGHULTZ.

AIR COMPRESSOR.

APPLICATION FILED JUNE 11,1904.

4 sums-sum 2.

uneutnr 5 gdtomzgw Egg/4e N0. 801L924. PATENTED DEC. 12, 1905.

W. J. SCHULTZ.

AIR COMPRESSOR. APPLICATION FILED mm: 11, 1904.

4 SHEETS-SHEET 3.

witnesses: 5 nmzntmc No. 806,924. PATENTED DEC. 12, 1905.

w. J. SCHULTZ.

AIR COMPRESSOR.

APPLIOATION FILED JUNE 11, 1904:

4 SHEETS-SHEET; 4.

jggow I y M gitome ga 3 IINITED STATES PATENT OFFICE.

WILLIAM J. SCHULTZ, OF DETROIT, MICHIGAN ASSIGNOR OF ONE-HALF TO CHARLES L. VIEMAN AND NVILLIAM H. TURNER, OF DETROIT,

MICHIGAN.

AIR-COMPRESSOR.

Specification of Letters Patent.

Patented Dec. 12, 1905.

To all whom, it may concern.-

Be it known that I, WILLIAM J. SCHULTZ, a citizen of the United States, residing at Detroit, county of Wayne, State of Michigan, have invented a certain new and useful Improvement in Air-Compressors; and I declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification.

My invention relates to an improvement in air-compressors shown in the accompanying drawings and more particularly set forth in the following specification and claims.

In the drawings, Figure 1 is a plan view of my invention. Fig. 2 is an inverted plan view of the same. Fig. 3 is a longitudinal section through the'pump-cylinder and-the valve controlling the operation of the pump on line 3 3 of Fig. 2. Fig. 4 is a longitudinal section through the opposite pump-cylinder on line 4 4 of Fig. 1, showing an auxiliary cylinder in which is contained a piston governing the operation of the valve shown in Fig. 3. Fig. 5 is a longitudinal section of a detail on line 5 5 of Fig. 1, showing the means employed to throw the driving-pulley of the pump into or out of engagement with the driving-pulley operating the same. Fig. 6 is a cross-sectional View through the cylinders and supporting parts on line 6 6 of Fig. 2. Fig. 7 is a side elevation showing the drivingpulleys in frictional contact and in dotted lines the position of the driving-pulley when the pump is at rest. Fig. 8 is a detail showing the antifriction-rollers over' which the sliding carriage moves.

One of the objects of my invention is to construct an air-compressor that will be operated by a suitable driving-pulley brought into frictional engagement with an independent driving pulley operated by any external means, the construction being such, however, that when the predetermined pressure in the storage tank or tanks has been secured the driving-pulley operating the pumps will be automatically thrown out of frictional engagement with thepulley employed to drive the pump by the air-pressure itself. When the pressure in the storage-tank falls below its fixed or predetermined pressure, the pulley controlling the action of the pumps will be forced again into frictional contact with the driving mechanism. It will thus be seen by further reference to the specification that the operation of the pumps is governed entirely by the condition of the pressure in the storage-tanks, the pumps being idle when the predetermined pressure is intact, or vice versa.

Referring to'the letters of reference shown in the drawings, A is the frame of the pump.

B and B are the pump-cylinders.

Z) and Z) are the pistons connected by the pitmen b and b with the disks C and C, supported on the shaft D, mounted on suitable bearings on the sliding carriage E.

6 and b are check-valves governing the inlet and delivery ports of the pump-cylinders.

A is a frame housed within the recesses formed in the bed plate or frame A and projecting into like recesses formed in the frame of the sliding carriage E.

A represents friction-rollers journaled in the frame A, over which the sliding carriage E travels.

e e are pins secured to the frame A and projecting into the slotted way formed in the sliding carriage E to act as guides when said frame reciprocates. The raised portion a, formed in the fixed frame A, also serves to guide the sliding carriageE by projecting into a slotted way at the other end of the traveling carriage.

D is a driving -pulley mounted on the shaft D.

F is a driving-shaft, and F is a pulley mounted thereon, designed to drive the pulley D when the latter is brought in frictional contact with its rotating surface.

E is a spring, one end of which is engaged with the lug E secured to the raised portion a of the fixed frame A, the other end ofthe spring having a bearing on the projecting pin E secured to the traveling carriage E, the action of the spring serving to force the pulley D into frictional engagement with the pulley F.

Gr represents pipes (having a flexible section g) leading from the pump-cylinders B to a slide-valve chest H.

G is a pipe leading from the chest to an auxiliary cylinder I.

G is a pipe leading to a storage-tank (not shown) from a T in the pipe Gr between the valve-chest and the auxiliary cylinder I. I

is a piston housed within said cylinder, the rod of which projects through an adjustable sleeve 2', mounted in the frame A, which serves as a bearing for the spring 1 coiled around the rod and bearing against the piston I. By adjusting the sleeve 2' the tension of the spring may be increased or diminished, as required.

i is an adjustable collar secured to the piston-rod, and which is engaged by the rocking arm J, pivoted to the frameA.

H is a slide-valve housed within the valvechest H, its operating-rod projecting through the chest and having an adjustable collar it socured thereto, which is engaged by the other end of the rocking arm J, the rocking arm J being provided with fingers straddling the rod of the piston 1 and engaging the collar 6 while similar fingers at the opposite end engage the collar on the. rod of the slide-valve H, as before explained.

J is a finger projecting from the rocking arm on a radial line from its pivot. J is a spring bearing on the end of said projecting finger J and engaging a stud pivoted to the frame A, the object being to hold the arm against accidental displacement when thrown I in either direction by the movement of the piston I.

K and K are pipes leading from ports in the valve-chest H to two oppositely-disposed air-chambers L and L, in which are secured the pump B into frictional contact with the.

independent driving-pulley. The pumps are thus set in motion and air delivered from the pump-cylinders by way of the slide-valve chest H, through the pipes G and G to a storage-tank (not shown) until a predetermined pressure has been secured, controlled by the action of the spring 1 hearing against the piston I, the tension of the spring I being regulated by the adjustment of the sleeve i. Now any further delivery and compression of air in the storage-tank will force the piston 1 against the action of the spring 1 and the projecting piston-rod will, through the action of the adjustable collar 2' secured thereto, operate the rocking lever J, causing the fingers on the end of the rocking lever to engage the adjustable collar on the stem of the slide-valve, thrusting the valve to the limit of its movement. By this action air will pass through the pipe K from the valve-chest H into the diaphragm-chamber L, distending its diaphragm and forcing the arm M, se-

cured to the traveling carriage, to the limit of its movement, thereby throwing the driving-pulley D of the pump out of frictional contact with the independent driving-pulley E. Then the air in the storage-tank falls below its predetermined compression, the action of the spring 1 bearing on the piston I, will cause the piston to return to the position occupied before compression of air in the storage-tank. In so doing the adjustable collar on the piston-rod will engage the rocking lever J and cause it to tilt in the opposite direction, permitting the air in the valve-chest H to pass out through the pipe K into the opposite diaphragm-chamber L, distending its diaphragm and forcing the projecting arm M, secured to the sliding carriage,forward, thereby pushing the carriage to the limit of its movement in the opposite direction and causing the pulley D, controlling the operation of the pump, to come in frictional driving contact with the independent driving-pulley F. As the slide-valve changes its position it will be apparent that the air in the diaphragmchamber L will exhaust through the port K as will also the air from the diaph'ragm-chamber L when the slide-valve is moved in the opposite direction. It will be seen that the spring E is employed merely to secure the initial operation of the pump. After the storage-tank is supplied with air the action of the sliding carriage is practically independent of the spring, which could then be dispensed with, as the condition of the pressure in the storage-tank will automatically control the operation of the pump. It will now be readily seen that when the air in the tank drops below its predetermined compression the action of the spring I on the auxiliary piston controlling the movement of the slide-valve will automatically shift the slidevalve so as to deliver air from the storagetank into the diaphragm-chamber L, and by means of the parts operating therewith the sliding carriage upon which the pump-driving pulley is mounted will force the pumpdriving pulley into frictional driving contact with the independent driving-pulley until the pressure in the storage-tank has reached its predetermined pressure, when the pumps will be thrown automatically out of operation.

Having thus described my invention, what I claim is- 1. In an apparatus of the class described, a reciprocating carriage, compression pumps mounted thereon, a frictional driving-pulley mounted on said carriage and geared to operate the pumps, a main driving-pulley to operate said pump-pulley, means operated by the air'under compression to shift the pumpdriving pulley into or out of frictional driving contact with the main driving-pulley as determined by the air-pressure itself,.sub stantial'ly as described.

2. In an apparatus of the class described, a

sliding carriage, adriving-pulley to operate the compression-pumps, an independent driving-pulley to operate said pump-driving pulley by frictional contact, a fixed frame, airchambers provided with elastic diaphragms supported therein, an arm secured to the sliding carriage and lying adjacent to the diaphragms of the air-chambers, means for delivering the air to and exhausting it from the air-chambers alternately, whereby the alternate distention of the diaphragms bearing against the arm of the sliding carriage will cause it to reciprocate thereby bringing the frictional driving-pulleys into or forcing them out of driving relation, substantially as described.

3. In an apparatus of the class described, a sliding carriage carrying a friction drivingpulley to operate compression-pumps, two op-' positely-disposed diaphragmed air-chambers, an arm secured to said sliding carriage and projecting between the air-chambers adjacent to the diaphragms, and means for admitting air to and exhausting from said air-chambers alternately whereby the sliding carriage is given a reciprocating movement in order that the driving-pulleys may be brought into frictional driving contact or released therefrom, substantially as described.

4. In an apparatus of the class described, a sliding carriage carrying a frictional drivingpulley to operate compression-pumps and having channels to receive a frame, a fixed frame provided with similar channels, a frame interposed between the fixed frame and sliding carriage and housed within the channels formed in the carriage and fixed frame, said intermediate frame provided with antifriction-rollers upon which the carriage travels, substantially as described.

5'. In an apparatus of the class described, a

sliding carriage, a driving-pulley to operate the compression-pumps, an independent driving-pulley to operate said pump-driving pulley by frictional contact, air-chambers provided with elastic diaphragms, an arm secured to the sliding carriage and projecting between the oppositely-disposed air-chambers adjacent to their elastic diaphragms, an auxiliary cylinder fitted with a piston having a projecting rod engaging a rocking lever, the lever, a

valve-chest, pipe connections from the compression-pumps to the valve-chest and from the valve-chest to the auxiliary cylinder, to the storage-tank and to the diaphragmed airchambers, and a sliding valve housed within the valve-chest under the control of said rocking lever to govern by its movement the admission and release of air to each of the airchambers alternately, substantially as described.

6. In an apparatus of the class described, a sliding carriage, compression-pumps suitably mounted, a driving-pulley to operate the compression-pumps mounted on the sliding carriage, an independent driving-pulley designed to operate the driving-pulley mounted on the sliding carriage when the latter is brought into frictional contact therewith, means controlled by a rocking lever for reciprocating said sliding carriage, the rocking lever, an auxiliary cylinder fitted with a piston having a projecting rod connected with said rocking lever, a spring having a bearing against one side of said piston, means for increasing the tension of said spring, pipe connections between said auxiliary cylinder and the source of air compression, whereby when said compression has reached a predetermined pressure the piston is forced against the tension of the spring to operate the rocking lever and ta throw the frictional driving-pulley out of driving contact with the power controlling the same, substantially as described.

In testimony whereof I sign this specification in the presence of two witnesses.

WILLIAM J. SCHULTZ.

Witnesses:

S. E. THOMAS, CHAS. TIMM. 

